High-Performance Window Choices on the Upswing

Last July, two California companies made a splash in the residential window-manufacturing industry when they announced that their new energy-efficient windows had been certified by the Passivhaus Institut (PHI) in Germany. Casagrande Woodworks and Wooden Window were the first U.S. manufacturers to win this recognition, and it meant that their windows met the requirements for recognition as a Passive House (PH) advanced component. These certifications, however, are just highlights among the growing availability of very high-quality, energy-efficient windows in North America.